The answer is; C
According to 2015 data, the US produces approximately 766,200 million cubic meters of LPG annually with the second being Russia producing 635, 500 million cubic meters. LPG is usually made from converting natural gas from hydrocarbon underground into a liquid for transportation and use as gasoline of jet fuel.
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Genetic variation happens when one organism in the population mates with a genetically different organism. Same species, different genetics such as color or height/weight.
The right answer is D (less responsive to antigens)
It is proven that, after puberty, thymus activity (an organ that is included in the lymphatic system, producing T cells that pick up antigens) decreases and that in adult and aged people the thymus has no role. Work done in humans indicate that in fact the cellularity begins to decline from birth in favor of lymphocyte perivascular spaces and connective and adipose tissue, which leads to a decrease in the capture of antigens.
